TY - JOUR
T1 - Superconductivity and electronic state of annealed single-crystals of FeSe1-xTex (0.6 ≦x≦1) studied by specific heat
AU - Imaizumi, Masato
AU - Noji, Takashi
AU - Adachi, Tadashi
AU - Koike, Yoji
PY - 2012
Y1 - 2012
N2 - We have investigated the superconductivity and electronic state in FeSe1-xTex (0.6 ≦ x ≦ 1) from the specific heat measurements, using annealed single-crystals of good quality. First, it has been found that annealed single-crystals of x = 0.6-0.9 exhibit bulk superconductivity with a clear specific-heat jump at the superconducting (SC) transition temperature, Tc. Both 2Δ0/k BTc [Δ0: the SC gap at 0 K] and Δ C/(γn-γ0)Tc [Δ C: the specific-heat jump at Tc, γn: the electronic specific-heat coefficient in the normal state, γ0: the residual electronic specific-heat coefficient at 0 K in the SC state] are largest at x = 0.7 and are 4.29 and 2.38, respectively, indicating that the superconductivity is strong-coupling. Secondly, it has been found that the γn value is much larger than that estimated from the band calculation and increases with increasing x and suddenly decreases above x = 0.9 due to the antiferromagnetic ordering around x = 1. The large value of γn is guessed to be due to the enhancement of the effective mass related to spin fluctuation and/or orbital fluctuation. Finally, it has been found that there remains a finite value of the electronic specific-heat coefficient at 0 K even in the SC state at x = 0.8-0.9. This suggests that a phase separation into SC and normal-state regions takes place at x = 0.8-0.9. Otherwise, there might remain a normal-state pocket at the Fermi surface even in the SC state.
AB - We have investigated the superconductivity and electronic state in FeSe1-xTex (0.6 ≦ x ≦ 1) from the specific heat measurements, using annealed single-crystals of good quality. First, it has been found that annealed single-crystals of x = 0.6-0.9 exhibit bulk superconductivity with a clear specific-heat jump at the superconducting (SC) transition temperature, Tc. Both 2Δ0/k BTc [Δ0: the SC gap at 0 K] and Δ C/(γn-γ0)Tc [Δ C: the specific-heat jump at Tc, γn: the electronic specific-heat coefficient in the normal state, γ0: the residual electronic specific-heat coefficient at 0 K in the SC state] are largest at x = 0.7 and are 4.29 and 2.38, respectively, indicating that the superconductivity is strong-coupling. Secondly, it has been found that the γn value is much larger than that estimated from the band calculation and increases with increasing x and suddenly decreases above x = 0.9 due to the antiferromagnetic ordering around x = 1. The large value of γn is guessed to be due to the enhancement of the effective mass related to spin fluctuation and/or orbital fluctuation. Finally, it has been found that there remains a finite value of the electronic specific-heat coefficient at 0 K even in the SC state at x = 0.8-0.9. This suggests that a phase separation into SC and normal-state regions takes place at x = 0.8-0.9. Otherwise, there might remain a normal-state pocket at the Fermi surface even in the SC state.
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U2 - 10.1088/1742-6596/400/2/022034
DO - 10.1088/1742-6596/400/2/022034
M3 - Conference article
AN - SCOPUS:84873639940
VL - 400
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - PART 2
M1 - 022034
T2 - 26th International Conference on Low Temperature Physics, LT 2011
Y2 - 10 August 2011 through 17 August 2011
ER -